Geometry

Question Analysis:
This question involves classifying a triangle based on both angles and side lengths.
The main focus is recognizing the properties of a right isosceles triangle.

Key Concept Explanation:
A right triangle has one 90° angle.
An isosceles triangle has at least two equal sides.
A right isosceles triangle has one 90° angle and two equal sides, meaning its angles are 45°-45°-90°.

Step-by-Step Solution:
The diagram shows that the triangle has one right angle → It must be a right triangle.
It also has two equal sides → It must be an isosceles triangle.
A right triangle with two equal sides is called a right isosceles triangle.
Checking the answer choices:
(A) Scalene Triangle: Incorrect, scalene triangles have no equal sides.
(B) Right Isosceles Triangle: Correct, the given properties match this definition.
(C) Equilateral Triangle: Incorrect, equilateral triangles do not...